What two numbers add up to 1899?

There are infinite combinations of two numbers that add up to 1899. Here are some examples using negative numbers:

-1 + 1900 = 1899
-2 + 1901 = 1899
-3 + 1902 = 1899
...

Here are some examples using two fractions that will add up to 1899:

1899/2 + 1899/2 = 1899
3798/3 + 1899/3 = 1899
5697/4 + 1899/4 = 1899
...

And here are some examples using two decimal numbers that will add up to 1899:

1.25 + 1897.75 = 1899
2.50 + 1896.5 = 1899
3.75 + 1895.25 = 1899
...

As you can see from the lists above, it can go on forever. However, when answering "What two numbers add up to 1899?", it may be more interesting to set some criteria to limit the result. We will set the follow criteria:

1) Only positive whole numbers can add up to 1899. (0 is not a positive or negative number and should not be included.)

2) Since a+b=29 is the same as b+a=29, we should only list it once.

Now, the answer to "What two numbers add up to 1899?" has 949 answers:

1 + 1898 = 1899
2 + 1897 = 1899
3 + 1896 = 1899
.
.
947 + 952 = 1899
948 + 951 = 1899
949 + 950 = 1899

We have truncated the list above due to space, but you may be interested to know that we calculated the number of answers by dividing 1899 by 2 and then rounded down to the nearest whole number if necessary.

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